d3.js - d3.event object in QtWebKit -


i'm trying use d3js inside qtwebkit. in particular i've created following test page:

<!doctype html> <meta charset="utf-8"> <style>  rect.pane {   cursor: move;   pointer-events: all; }  </style> <body> <script type="text/javascript" src="d3.min.js"></script> <script type="text/javascript"> var margin = {top: 20, right: 60, bottom: 30, left: 20},     width = 960 - margin.left - margin.right,     height = 500 - margin.top - margin.bottom;  // svg var svg = d3.select("body").append("svg")     .attr("width", width + margin.left + margin.right)     .attr("height", height + margin.top + margin.bottom)   .append("g")     .attr("transform", "translate(" + margin.left + "," + margin.top + ")");  var zoom = d3.behavior.zoom()     .on("zoom", draw);  svg.append("rect")     .attr("class", "pane")     .attr("width", width)     .attr("height", height)     .call(zoom);   function draw() {     console.log(d3.event); } </script>

the purpouse of html code have rect "firing" scroll event , retrieve scale value d3.event object, explained in https://github.com/mbostock/d3/wiki/zoom-behavior.

if load example in chrome, looking @ console can see object d3.event:

object {type: "zoom", scale: 1.0511729090877093, translate: array[2], sourceevent: wheelevent, target: function}

now i've inserted example qtwebkit widget; using qmainwindow:

mainwindow::mainwindow(qwidget *parent) :   qmainwindow(parent),   ui(new ui::mainwindow),   view(new qwebview(this)) {   ui->setupui(this);   setcentralwidget(view);   view->load(qurl("qrc:/html/test.html"));    qwebframe *webframe = view->page()->currentframe();   webframe->addtojavascriptwindowobject(qstring("callback"), this); }

with

q_invokable void callbackscrollevent(qstring data);

and

void mainwindow::callbackscrollevent(qstring data) { qdebug() << "test" << data; }

but d3.event object empty:

test "[object object]"

is there i'm missing? i'm using qt 4.8.4 using qt 5.0.1 issue still present.

in chrome can see object too. chrome developer tool expand , display structure of object. "[object object]" right result in code.

you can try change code

function draw() {     console.log(d3.event); }

to

function draw() {     console.log(d3.map(d3.event)); }

this transform object map, key object's properties. may results like

u {type: "zoom", scale: 1.1809926614295303, translate: array[2], sourceevent: wheelevent, target: function}

i not sure in qtwebkit. if cannot want, can debug/check specific property output following:

console.log("type:"+d3.event.type) console.log("scale:"+d3.event.scale)

you get

type:zoom fiddle.jshell.net:46 scale:1.1809926614295303

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